Commit before branching to chane EdgeModel and EdgeRecord.

include/mvcc/edge_record.hpp

@@ -0,0 +1,11 @@
+#include "mvcc/version_list.hpp"
+#include "storage/edge.hpp"
+
+// class EdgeRecord: public mvcc::VersionList<Edge>{
+// public:
+//     using mvcc::VersionList<Edge>;
+//
+//     VertexRecord* get_key(){
+//         //TODO
+//     }
+// };

include/storage/model/edge_map.hpp

@@ -0,0 +1,31 @@
+#pragma once
+
+#include "data_structures/map/rh_hashmultimap.hpp"
+#include "mvcc/version_list.hpp"
+
+class EdgeMap
+{
+public:
+    auto begin() { return edges.begin(); }
+    auto begin() const { return edges.begin(); }
+    auto cbegin() const { return edges.begin(); }
+
+    auto end() { return edges.end(); }
+    auto end() const { return edges.end(); }
+    auto cend() const { return edges.end(); }
+
+    size_t degree() const { return edges.size(); }
+
+    void add(EdgeRecord *edge) { edges.add(edge); }
+
+    void remove(EdgeRecord *edge)
+    {
+        // TODO
+        throw std::bad_function_call::bad_function_call();
+    }
+
+    void clear() { edges.clear(); }
+
+private:
+    RhHashMultiMap<VertexRecord *, EdgeRecord> edges;
+};